Anyone have any tips to make a homemade squirrel call?

After having an empty haul the other day, I stated to think about using a call.

I've heard about one where you strike 2 quarters together on their edge, and that's supposed to replicate the sound of one cutting and gnawing on nuts, which would draw others in to score some easy food. Tried doing that for about an hour and didn't get one to investigate (heard a few chattering at each other, but they never came to me).

They were probably looking at you chattering. If you know a tree they like get a stick about 9" long, tie a long string to it. Put it in a bush on the opposite side of the tree from were you are. Every once in a while, give it a tug. They will come down to see what the noise is, and once down they will run around to your side not sure of what is making the noise and you pop them. You can also try a sqeeker for Yotes or even a sqeeker from a dog toy. They are very curious creatures.